from The Century Dictionary and Cyclopedia

Etymologies

From affy, to make affidavit, from Middle English affien, to trust, from Old French affier, to promise; see affiance.

(American Heritage® Dictionary of the English Language, Fourth Edition)

From the present participle of Old French afier, from Late Latin affidare. Related to affidavit. (Wiktionary)

Examples

R.L. 113, § 54. fjoiints of such corporation shall be competent evidence in all cases, equally with the originals thereof, if there is annexed to such copies an affidavit taken before a clerk of a court of record or notary public, under the seal of such court or notary public, stating that the affiant is the officer having charge of the original records, books and accounts, and that the copy is true and correct and is full, so far as it relates to the subject-matter therein men - tioned.

Copies from the records, books and ac - copies from counts of every such corporation shall be competent evi - as evidence. '' dence in all cases, equally with the originals thereof, if there is annexed to such copies an aflSdavit taken before a clerk of a court of record, or notary public, under the seal of such court or notary public, setting forth that the affiant is the officer having charge of the original records, books and accounts, and that such copy is true and correct and is full so far as it relates to the subject-matter therein re - ferred to.

Your affiant states that Congresswoman Giffords' staff at the event included Gabriel Zimmerman, Rob Barber, and Pamela Simon, who are employees of the United States, all of whom attended to assist Congresswoman Giffords in her official duties.

These kinds of undemanding romances, which George Eliot once called "spiritual gin," serve their purpose — to entertain and soothe — and I imagine they're even tastier after a day of reading sentences like, "Further affiant sayeth naught."

“Sheriff Doran advised affiant that Becky Musser has provided him with information regarding the FLDS on more than 100 occasions over the past four years, including as recently as April 8, 2008, and that, on each occasion, that information has proven to be reliable, true and correct,” Wilson wrote in the probable cause statement.

"Your affiant believes that the recovered items from the security checkpoint and Motley's apartment were packaged in a manner consistent with the trafficking of contraband into correctional facilities."

It's the legal definition that counts if you want to take legal action, and it's not in the least obvious that any alleged lies were "material" (in the Kungys sense), not to mention perjury requres the affiant to believe that what he's saying is false (rather than just being misleading or evasive; see Beckstrom).